determine the constant and the variable

1. Constant = 0
Variable = b
2. Constant = 3
Variable = x
3. Constant = 0
Variable = c
4. Constant = -4
Variable = y
5. Constant = 5
Variable = f
6. Constant = 0
Variable = g, h
7. Constant = 0
Variable = m, n
8. Constant = 0
Variable = n
9. Constant = 0
Variable = q, r
10. Constant = 0
Variable = m, π